05-06-2012 03:41 PM - edited 05-06-2012 03:55 PM
It's a bit of a hack, but as usual: if you've got an iThingy you can play Stereomood tracks from iPeng's built-in browser and you can at least queue up songs in the current playlist. Will have to see whether you can save tracks to favorites, too (I don't know whether the track URLs are persistant so will still be valid after a while).
What you can not do until somebody writes a plugin is to play whole "moods"/playlists autonomously or to save a whole mood to favorites.
Author of iPeng.
Learn more about iPeng, the Squeezebox and UE Smart Radio App for iPhone or iPad on penguinlovesmusic.com